Extrinsic 3966-1

{
  "heartbeat": {
    "blockNumber": 3965,
    "sessionIndex": 66,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x44f4703e6b0511011d3f031b766a10107e1fed9714ecd9256b8b256fb1fc534ff306e82e0f17ad17ee16c6475513c93a1bf23d33ad12353711bf150c63f56887"
}